Pump jack



Sept.4 21 1926.

J. H. CARSON PUMP JACK Filed Dec.

. petroleum fiel s for instance, the weight of] Patented Sept. 21, 1926.

UNITED: STA

LOS ANGELES, CALIFORNIA.

, 1,600,576 TES PA JOHN CARSON, oF GLENDALE, CALIFORNIA, AssiGNoRoF oN-nrHIRi) 'ro C. CARTER, oF GLENDALE, CALIFORNIA,y AND omi-THIRD To ANsoN RoniNsoiu,

TENT OFFICE..

PUMP JACK.

Appiicationsied iafltceniuer74.11925.v seriai No.v 73,735.`

In this specification, and thel accompany- V V)ack-shaft 4, rotatablein bearings 54 suping drawing, I shall describeand show la preferred form of my invention, and specifically mention certain of its `more important objects. I do not limit myself to the forms disclosed, since various changes and adaptations, may be made therein without departing jfrom the essence of my invention as hereinafter claimed; and objectsandad- Vantages, vother than those specifically mentioned, are included within its sco e.' f

vMy invention relates to means for pumping'deep wells and the like, ,and among .its morev important objects are;`first, to provide a device of this nature .adapted for making very long pumping strokes; second', to furnish means foreffectively ycounterbalancing lthe weight of the pumpingyrod and its attachments throughout its stroke; third, to supply means :for partially counterbalancing theweight ,of `pumped material supported` by the pumping'.r`od;and, fourth, to accomplish 'the foregoing' meansof a simple and relatively inexpensive construction that is especially Well adapted for its intended service.

My objects are attained in the manner illustrated in the accompanying drawing, in Which- Figure 1 is a side elevation of my invention with ycertain parts shown in section;v

Figure 2 is an end elevation of the upper portion of the above construction when look in the direction of arrow 2 of Fig. 1; an

Figure 3 is an enlarged detailed elevation .of a portion of one of the equalizing bars of my invention, with its attachments; lthe view being shown partly in section.

Similar reference numerals refer to simi# lar parts throughout the several views.

In the pum ing ofv deep wells, as in the the pumping rod and itsattachments plus the weight ofthe column of liquid being lifted thereby, is often enormous. Y. Under such circumstances itis desirable to make the pumping stroke as long as possible to reduce the inertia losses due to reciprocating thesel great masses. "It is also Vdesirable to counterbalance the reciprocating masses throughouttheir strokes so far as this can be done, in orderto further reduce the V power required for pumping. y. p

"i vinvention as illsutrated comprisesv a ported-by; a frame 6, and located over the casing head 7 of the well to be pumped.

The jack-shaft has a plurality of sprockets i attachedA to a pairk of equalizing bars 11 i and When more thaii one sprocket is used,` on` each .side of the central gem-,the attachments of the chains tothe equalizing barsv is made yieldable, so ast() Place Sub; j

stantially thek same duty upon each one of 'her'cllai-ns.' This may be convenientlyraccomplished, as shown, by ,employing clevis bolts 13'at the ends of the chains, and coinpression springs 141-.` surrounding `the bolts between'theirinuts 154 and the equalizingv bars. The clevis` bolts `are yslidable inthe bars land:fthesprings thereforeprovide a lresilient engagement ,between the chains .and

the'bai 'js. Aj-Thef"teiis'ifo'n 4on the chains" may -be equalized by'mea'i'is of"nuts`15.

The pumping rod 16 is lcentrally hung from equalizing bar 11, yand a counterweight 17V is centrally hung from equaliziiig bar l2.

The counterweight preferably is slightlyr lheavier'than the combined weightsofl the pumping rod and its attachments, and weighs somewhat less than thesev combined weights plus the Weight of the column of liquid being pumped. Consequently, if

friction is not considered, power will have to be expended on the up-stroke of rod 16 only forlifting a portion of the weight of the column of .liquid being pumped. On the down stroke of the ,pumping rod power will have to be expended only for lifting the unbalanced portion of the counterweighh Y From a consideration of vhe above it will be apparent that the power expended on the 'up and down strokes may bevery nearly equalized; and that lthe power consumed on both strokes isrelatively very vsmall since by far the greater portion of the weight being lifted in each case is counterbalanced by a descending weight.'

,opposite directions. This is accomplished by To 'secure reciprocation of pumping rodVr 16 thejack-shaft 4 is rotated alternatelyin and the engagement being maintained by means of an oscillatable yoke 20. The rack is adapted to slide longitudinally in the yoke and the variable angularity of the rack is taken care of by the pivoted engagement ofY the yoke on jack-shaft fl.

Connecting rod 19 is actuated by a crank pin 21 rotated by the large gear 22, and the latter is driven by pinion 23. The power for driving the pumping mechanism may heap- -plied in any ,convenient manner to` shaft 24 von'l which the pinion 23 is' fixed.

Von both strokes of the pumping rod, the

powerflow may be made substantially uniform. It will also be seen that any reasonably desired pumping stroke is easily `obtainable and easily variable, as by changing the throw of crank pin 2l by relocating it in one of the holes 25.

A feature of my invention that greatly adds to its utility is the pivoted attachment of frame 6 to its base 26. The base is pro vided with upstanding plates 27 at the coiners, and the upper Vframe is attached to these by, means of bolts 28. one pair of these bolts the other pair may be utilized as hinge pins for tipping the frame laterally. The tippingcan be done by power if a pin is inserted through hole 29 in By removing yoke 20, and through a corresponding hole in rack bar 18. In this manner the structure above the casing head of the well may be quickly placed out. of theway when the Y pumping rodsj etc., have to be withdrawn.

Having thus fully described my invention, I claim:-

LA device of the characterV described, comprising; a jack-shaftvhaving a sprocket fixed thereon; a chain engaging said sprocket having depending ends respectively supporting a pumping rod-and a counterweight; a .gear .fixed upon said shaft; a crank-pin rotatable invan orbit spaced from the gear in a plane parallel theretogand arigidbar operatively connected at one end to said crank-fpin'and havinga rack at its other end olperatively engaging said gear7 whereby said siaft may be rotated alternately 'in opposite directions by Itlie'orbital rotation of said crank-pin. I

2. A device vof the character described comprising a yj ack-'shaft vhzu'fing a plurality of sprocketsked thereon; a 'chain 'engag-y ing each olf said sprockets having depending ends grresilient'attaching connections at each of'said chain ends; apair of equalizing bars respectively engaging the corresponding chainends by fm'eans of said resilientconnec'tions; a pumping rod yinte'rmediately supported byone of said bars; a counterweight interinediately supported by the other said bar; and meanstfor rotatingsaid shaft alterl nately in opposite directions. y 

